RF Design of On-Chip EMI Filters in CMOS Logic IC

In this paper, we present new design methods that provide the radio frequency (RF) rejection performance of on-chip electromagnetic interference (EMI) filters in a complementary metal-oxide semiconductor (CMOS) logic integrated circuit (IC). In order to simulate on-chip performance, we consider the following concepts. Firstly, simulation models consist of simulation program with integrated circuit emphasis (SPICE) models of logic circuits, an IC chip design, an IC package design and a printed circuit board (PCB) design. Secondly, RF rejection performance is obtained using a frequency domain analysis of output data signals from ICs including and excluding EMI filters. Simulation results show that an on-chip-type EMI filter has better performance in the frequency band for wireless communications than other types of EMI filter. The measurement results show good agreement with the simulation results.